Lake Powell only 52 percent full; Colorado water managers study ways to avoid call for more water downriver
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GRAND JUNCTION — About 120 water managers gathered Wednesday, April 25, to discuss how to keep enough water in Lake Powell and avoid a demand from downstream states for more water under the Colorado River Compact, and they agreed to keep studying potential solutions.
The meeting, held at the Ute Water Conservancy District, brought together members of four Western Slope basin roundtables to discuss the third phase of an ongoing “risk study” that seeks to define how much water might need to flow toward Lake Powell during a sustained dry period instead of being put to use growing crops.
The basin roundtables operate under the guise of the Colorado Water Conservation Board, a state agency charged with planning to meet the state’s water needs and its obligations under the interstate water compact negotiated in 1922.
If Lake Powell — which today is 52 percent full and at 3,610 feet in elevation — drops below 3,490 feet, then the hydropower plant in Glen Canyon Dam, which backs up the Colorado River to form Lake Powell, won’t be able to continue producing electricity.
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And as the water level in the reservoir falls, it also makes it increasingly hard to release the volume of water necessary for the Upper Colorado River basin states to meet their obligation to the lower-basin states under the compact.
“I don’t want to project that it’s coming, but the possibility of it happening exists,” said Karen Kwon, an attorney at the Colorado attorney general’s office who works on Colorado River issues, about the potential for a “compact call.”
And she told the audience of water managers and users that the “hydrology is tanking” as the Upper Colorado River basin continues to be mired in an 18-year dry period.
An ongoing study conducted by a consultant for the Colorado River Water Conservation District has found that a series of severely dry years could produce the need to send 1 million acre-feet — about 10 Ruedi Reservoirs full of water — down to Lake Powell to keep it at sustainable levels.
“Those are big volumes of water,” Carron said, and not easy to find in a pinch, especially after water in big upstream reservoirs such as Flaming Gorge also has been released to bolster water levels in Lake Powell.
The water is envisioned to come from ranchers who voluntary agree to fallow their fields, which in Colorado are mainly fields of alfalfa, in exchange for money, and send the water toward Lake Powell instead of using it for irrigation.
But there is a long list of unanswered questions about the concept, including where the water from the “conserved consumptive use” effort could be stored until needed.
John Carron, of Hydros Consulting of Boulder, who is leading the water-modeling study, showed a graphic Wednesday of a “hypothetical” reservoir, or “water bank,” near the Colorado-Utah state line that would hold 1 million acre-feet of water, but he also said the saved water could be stored in Lake Powell itself or in existing reservoirs in Colorado.
“The best place to put it is in Lake Powell,” said Eric Kuhn, the former general manager of the Colorado River District, who continues to work part time for the district.
However, right now there is no way, at least from a policy or legal standpoint, for the upper basin states to store water in Lake Powell in a designated, and protected, pool of water within the reservoir, as there is in Lake Mead.
And, Carron said, trying to “bank” 1 million acre-feet of water in existing reservoirs in the upper basin states is problematic.
New dam and reservoir
Alden Vander Brink, the manager of the Rio Blanco Water Conservation District in Rangely and a board member at the Colorado River District, asked why not work toward building new “wet water” storage projects?
Vander Brink is currently leading an effort to gain approval for a dam and reservoir called the Wolf Creek Reservoir, which would hold up to 1.2 million acre-feet of water from the White River.
A lot of questions were posed but left unanswered at Wednesday’s meeting, including the true cost of trying to reduce the risk of Lake Powell dropping too low, how water left in rivers and streams could be guaranteed to reach the big reservoir, how a compact call would actually unfold and who it would affect and how much money it might take to entice ranchers to fallow fields and participate in a large water banking or “demand management” program.
Rachel Richards, a Pitkin County commissioner who serves on the Colorado River basin roundtable, said the solution to the state’s water shortages should be equally shared on both sides of the Continental Divide.
At the end of the meeting, none of the attendees disagreed with the proposal to keep studying the issue. A proposed outline of the next phase of the study is to be brought back before the basin roundtables and then to the directors of the Colorado Water Conservation Board for their review and approval.